Here a diagram of the battery grounds from an '86

http://img138.imageshack.us/img138/2906/ground1s.jpg

location chart:

http://img222.imageshack.us/img222/6159/ground2.jpg

I can put up location pictorial if you need. See reference on location chart.

 

I have found that, especially in the engine bay, the colors on many wires have faded over the years and look like different colors.
Tan looks white etc.

 

Appreciate your input but differences in color on the chart can't be due to fading. On wire colors I realize that tan can fade to white or gray to white.
Some examples of what I mean:
1) #1 wire to EEC is listed as violet, on my truck it is yellow.
2) One wire to diagnostic test connector is listed as dark green/yellow. Actual colors are black w/white stripe, gray/red, tan/red, and solid gray.
3) EEC power relay: on diagram--white, black/lt green,red, yellow. Actual: yellow, yellow/green dash, blue, black/yellow stripe.
4) TFI connection: diagram--white/lt blue, black, yellow/lt green, dark blue, dark green/yellow. Actual--blue, yellow/green dot, red/bllue, yellow/green dash, lt green, black.
These are 4 examples of differences. Just can't be because of fading or color change. I'm convinced that they made different wiring harnesses or the wiring diagram I have is in error.

 

These diagrams ('86) seem to match some but not all of what you have:

EEC including EEC relay, Test connector and TFI:
http://img839.imageshack.us/img839/6185/8650eecp1.jpg

http://img684.imageshack.us/img684/5610/8650eecp2.jpg

http://img854.imageshack.us/img854/7408/8650eecp3.jpg


Note that my manual ('86) states that generally Ford uses only solid or solid with stripe wire colors. They don't use dashes or dots except in extreme cases where the OEM sub assembly harness maker has requested a deviation. They sorta implied that Ford once did use 'hashed' schemes but did not say when it was discontinued.
In tinkering around in my truck I haven't noticed any dashed wire color except for some wires embedded in the horn bar assembly.

 

I almost put my 86 diagrams up for him, but weren't sure if they were the same or not. I have run into some weird wiring on Fords but no where as bad as Chrysler products.

 

Thanks for your input.

 

Have you looked at my diagrams in post # 5? These are actual Ford Diagrams for a 1985, not aftermarket.

1) #1 Power feed wire to EEC is YELLOW in my diagram. Circut #37.

2) Diagnostic Connector: On my Diagram. Large Connector: Black/white stripe, Tan/Red, Tan/Light Green Small one wire Connector: White/Red

3) EEC Power Relay: My diagram: Yellow, Dark Blue, White/Light Blue, Black/Light Green

4) TFI IV: Dark Blue, Yellow/Lt. Green dot, Red/Lt Blue, Dark Green/Yellow, White/Light Blue, Black

There is some slight deviation, but it seems to be the closest.

I also have that diagram, it almost exactly matches the 1985 diagram I posted. Ford started changing their diagrams in 1986 to a more user friendly version. Other than that I see no differences between them.

I checked the diagram for the 1987 just for fun, and there are some wiring color differences even to the two we posted.

It never was discontinued persay. They just reserve Dots or hashes for dead last when absolutely nessecery to use them. This is usually due to all the other color combinations were already used before. Ford has been using the same basic wire color scheme since the 1970s.


Hutch, what is the production date of your truck? And what is the DSO code? Both can be found on the safety certification lable on the drivers door "B" pillar.

 

Production date is 8-85, and the DSO code is 52

 

8-85? That most likely makes this truck a 1986 model, or an extremely late 1985. The new year model production began in August.

The DSO code states it was sold to the Dallas Sales District. So It's a USA model.

I'll look through my 1986 diagrams and see if there are anything closer to what you need. Might take me untill tomorrow though.

 

My '86 shop manual set also came with the older style 12.5" x 25" plotted schematics dated 8/5/85. I rarely refer to these cause it's harder to follow.

 

FWIW, Some of the wire color usage goes clear back to the 50s. I have the entire EFI diagrams from the 86 EVTM, unfortunately it is too large a file to upload. Go to my website and on the left side you will see "downloads" from there it will take you to a list, under Ford you will see "86_5.0L_EFI". get it from there.